Hello, I am happy to help you today! Use of my answers are for educational purposes only.
Can you clarify what you mean by joint?
The ischium and illium are part of the pelvis, Vertebra don't from joints either. So the manurbrium is part of the sternum where the ribs attach to it so that might be what you are looking for.
Are you talking about fixed joints or moveable joints, synovial joints?
Than it would be the manurbruim